NEW SYNCHRONIZATION METHOD FOR THREE-PHASE FOUR-WIRE PWM CONVERTERS UNDER UNBALANCE AND HARMONICS IN THE GRID VOLTAGES

摘要

This paper proposes a new open-loop synchronization method for three-phase four-wire PWM converters connected to the utility grid. It presents a better performance in terms of distortions in the synchronism signals if compared with other open-loop methods. In addition, a frequency adaptation algorithm is proposed for applications where large frequency variations are expected, such as in weak grids. Experimental results using a DSP TMS320F2812 are given to demonstrate the good performance of the proposed synchronism method.